A magnet insertion assembly (200) and other related apparatuses for targeting openings in a hollow object, such as an intramedullary nail, are provided herein. A version of the magnet insertion assembly includes a sheath (201) having a proximal end and a distal end, a magnet member (20) disposed on the distal end of the sheath, an inner detent sleeve (220) connected to the sheath, and an outer detent sleeve (230) slidably disposed about the inner detent sleeve. The inner detent sleeve is configured to discretely move from a first defined position to a second defined position with respect to the outer detent sleeve, thereby discretely moving the magnet member from a first defined magnet position to a second defined magnet position. The magnet insertion assembly preferably includes a magnet member configured to produce both a static magnetic field and an induced, pulsed magnetic field to permit targeting without moving the targeting apparatus. The magnet insertion assembly also preferably includes an engagement device on or proximal to the magnet member that is configured to reversibly engage an engagement site at or proximal to an opening in the hollow object. Methods of using the apparatuses described herein are also provided.La présente invention propose un ensemble dinsertion (200) daimant et autres équipements associés pour viser des ouvertures dans un objet creux, tel quun clou médullaire. Une version de lensemble dinsertion daimant comprend une gaine (201) ayant une extrémité proximale et une extrémité distale, un aimant (20) disposé sur lextrémité distale de la gaine, un manchon intérieur dencliquetage (220) rattaché à la gaine et un manchon extérieur dencliquetage (230) disposé coulissant autour du manchon intérieur dencliquetage. Le manchon intérieur dencliquetage est configuré pour se déplacer de façon discrète dune première position définie à une seconde position définie par rapport au manchon extérieur dencliquetage, déplaçant de ce fait de façon discrète
